"[Video] - This is what Happend to his Ex GirlFriend! Play Video! She could not walk properly for days!" read one variant of the first scam, according to Naked Security, the Facebook-watching blog of the British security firm Sophos.

Anyone who clicks on the link is first taken to a confirmation window which asks: "Are you older than 18 years of age? Click 'Jaa' button 2 times to confirm and play video."

"Ja" means "yes" in many northern European languages, but as Sophos' Graham Cluley points out, "jaa" means "share" in Finnish — and if you click "jaa" in this instance, you'll be sending the video scam to all your Facebook friends.

Once you've done that, you don't get to see any salacious videos at all. Instead, as with most Facebook scams, you're invited to fill out a marketing survey, which earns the scammer a couple of bucks.

It's the same deal with the iTunes scam. Users who click on the link underneath "Free $25 Apple iTunes Giftcard" are taken to a website outside Facebook, where they're instructed to share the link with all their friends before they can proceed.

Once that's done, the next step is ... to fill out a marketing survey. It's not clear if there are any iTunes gift cards at all at the end of this rainbow.

Free money is hard to resist, but Cluley has advice for anyone seeking to satisfy more earthly urges via Facebook: "There's plenty of photos and videos of naked ladies out on the Web which you can peruse at your leisure, without the risk of flooding the newsfeeds of your Facebook friends."